Teikoku USA | Chempump
Instruction Manual HE-12270 (1219)
6
1. General Information
Figure 1-1. Type-F (Plan 1-SD) Pressurized Circulation ALP Multi-stage Pump
1.1 General Design and Operation
The Type-F (Plan 1-SD) pressurized circulation ALP multi-stage
pump is a combined multi-stage centrifugal pump and squirrel
cage induction electric motor designed and produced as a single
hermetically-sealed unit. The pump impellers are enclosed and
mounted on one end of the motor rotor shaft, which extends
from the motor section into the pump impeller casings. The mo-
tor rotor is hermetically sealed or “canned” with a corrosion re-
sistant, non-magnetic, alloy shell to isolate it from contact with
the pumped liquid being circulated through the liquid cooled
motor assembly. The rotating rotor and shaft assembly and it’s
supporting thin film liquid lubricated bearings, operate immersed
in the circulating liquid, functioning as both a motor coolant and
bearing lubricant. The motor stator winding is also canned with
a corrosion resistant, non-magnetic, alloy liner, to simultaneously
isolate it from the same circulating liquid.
The Type-F (Plan 1-SD) pressurized circulation ALP multi-stage
pump is characterized by the use of an external circulation pipe to
channel a portion of pump discharge flow of highly volatile fluids
and liquefied gases into the rotor cavity of the motor. Through
flow and pressure control mechanisms designed into canned mo-
tor pump assembly, the circulating fluid is pressurized above its
vapor pressure to assure required motor cooling and the estab-
lishment of the bearing liquid film for rotating element support.
The flow path of the Type-F (Plan 1-SD) pressurized circulation
ALP multi-stage pump is shown in
Figure 1-1
and
Figure 1-2
. The
circulating liquid is channeled from the discharge flange to the
motor section through the circulation pipe. The circulating liquid
first lubricates the rear bearing, then passes over the rotor, cool-
ing the motor, moves forward to lubricate the front bearing and
then exits the motor section through the front bearing housing.
The fluid returns to the high-pressure region of the final stage
impeller for joining the pump discharge flow.
The Type-F (Plan 1-SD) pressurized circulation ALP multi-stage
pump offers an advanced low probability machine through true
secondary containment provided as a standard design feature. In
the event of a primary containment can failure, the motor ex-
ternal shell or band assembly, which is designed for the same
pressure as the pump, in conjunction with the motor’s leakproof
terminal plate, provides complete secondary containment. This
standard feature prevents any release of the process liquid out to
the atmosphere.
A standard feature of the Type-F (Plan 1-SD) pressurized circula-
tion ALP multi-stage pump is the patented Teikoku Rotary Guard-
ian (TRG™) bearing wear monitor. The TRG is an electrical meter
that continuously monitors the condition of the bearings enabling
data based preventative maintenance scheduling. For more infor-
mation on the TRG see
Section 2.3.1
.
IMPORTANT!
NRTL certification per UL 778 and
CAN/CSA C22.2 No. 108-14 requires operation with
oil filled stator winding
